The past few weeks we've been exploring the idea of rates in our math class. It's a simple concept, but one that is one of the most useful for everyday math situations. If I can buy 3 hamsters for $5, how much would 9 hamsters cost? If I can write three notecards in 15 minutes, how long will it take me to make 20?
We began our exploration by talking about the word "per" and thinking about rates we already use in our every day lives. We've practiced using charts to help us solve problems involving rates. We've talked about unit pricing, why it's usingful and how to find a unit price reliably.
This last item opened up into a discussion of calculator use and decimals. We've talked a lot about what part of a number is "useful" for what we're doing and how to focus on whole numbers first, then work into the decimals for comparisons. Our number one rule for looking at a calculator display screen is "Don't freak out, find the decimal point!"
We'll return to the idea of rates again and again throughout the year. After all, a rate is a ratio, a ratio is a fraction...you get the idea. To wrap up our current work, we've gone down to the Pit Stop to do some price comparisons. Students are working out how much different products cost per serving and trying to convince their team which products they should buy with their budget. (It was especially amusing today to listen to G.S. try to convince his group that a $1.89 single serve jaw breaker the size of a tennis ball was a good way to spend close to half the budget.) We'll return to the Pit Stop on Friday to act on their decisions.
Look for opportunities to help your child practice rates: allowance saving, recipe doubling, unit pricing, circular ads, speed limits.